replace the horrible error system with multiple returns

examples/puzzles/aoc2024_01.zr

@@ -15,7 +15,11 @@ func part2[l1: Array, l2: Array] : void
     io.println_i64(out)
 
 func main[] : i64
-    lines : Array = must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
 
     l1 := []
     l2 := []

examples/puzzles/aoc2024_02.zr

@@ -40,7 +40,11 @@ func part2[data: Array] : void
     io.println_i64(out)
 
 func main[] : i64
-    lines := must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
 
     data := []
     for i in 0..lines->size

examples/puzzles/aoc2024_04.zr

@@ -56,7 +56,11 @@ func part2[lines: Array] : void
     io.println_i64(out)
 
 func main[] : i64
-    lines : Array = must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
 
     part1(lines)
     part2(lines)

examples/puzzles/aoc2024_05.zr

@@ -47,7 +47,11 @@ func part2[updates: Array, rules_left: Array, rules_right: Array] : void
     io.println_i64(out)
 
 func main[] : i64
-    data := must(io.read_text_file?("input.txt")) |> str.split("\n\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    data := str.split(input, "\n\n")
 
     rules_left := []
     rules_right := []

examples/puzzles/aoc2024_07.zr

@@ -61,7 +61,11 @@ func part2[equations: Array] : void
     io.println_i64(out)
 
 func main[] : i64
-    lines := must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
     equations := []
 
     for i in 0..lines->size

examples/puzzles/aoc2025_01.zr

@@ -47,7 +47,11 @@ func part2[lines: Array] : void
     io.println_i64(password)
 
 func main[] : i64
-    lines := must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
 
     part1(lines)
     part2(lines)

examples/puzzles/aoc2025_02.zr

@@ -54,7 +54,11 @@ func part2[ranges: Array] : void
     io.println_i64(sum)
 
 func main[] : i64
-    ranges := must(io.read_text_file?("input.txt")) |> str.split(",")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    ranges := str.split(input, ",")
 
     part1(ranges)
     part2(ranges)

examples/puzzles/aoc2025_03.zr

@@ -45,7 +45,11 @@ func part2[lines: Array] : void
     io.println_i64(sum)
 
 func main[] : i64
-    lines := must(io.read_text_file?("input.txt")) |> str.split("\n")
+    ~input, ok := io.read_text_file("input.txt")
+    if !ok
+        panic("failed to open input.txt")
+    
+    lines := str.split(input, "\n")
 
     part1(lines)
     part2(lines)